| Abbreviation | Definition |
|---|---|
| INU | India Unbranded/Unlocked |
| INWATS | INward Wide Area Telecommunications Service |
| IO | Inter-Office |
| IOC | Inter-Office Channel |
| IOCA | Interception Of Communications Act |
| IOS | Internet Over Satellite |
| IOT | Inter-Office Trunk |
| IP | Intelligent Peripheral |
| IPAD | Interactive Personal Application Device |
| IPC | Initial Paging Channel |
| IPCC | Internet Protocol Contact Center |
| iPCU | iPhone Configuration Utility |
| IPCX | Cisco IP Contact center eXpress |
| IPCX | Personal Communication Exchange |
| IPD | Intelligent Pulse Decoding |
| IPLC | International Private Leased Circuit |
| IPM | Interpersonal Messaging System |
| IPNT | Internet Protocol Network Telephony |
| IPOD | Internet Phone Over Data |
| IPS | In-Plane Switching |